Chung Leakage Quantity Calculation of Foundation Pit on the Condition of the Cut-Off Wall Insert into Impermeable Layer
详细信息
- 责任者：Feng Xiaola (Faculty of Engineerin ; China University of Geoscience ; Wuhan 430074 ; China) ; Li Dongguang
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(5)
- 关键词：工程降水 ; engineering drawdown
- 页码：p.16-21
- 图表：5 illus., 6 tables, 18 refs.
- 分类号：1702
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
Determine the sealing effect of the cut-off wall which insert into impermeable layer and quantitative calculate the pit leakage amount which leak through the cut-off wall are the important basis for pit dewatering design,which pit set with the sealed cut-off wall.By using the pumping test and the connectivity test,summed up the variation law of flow and drawdown of experimental well when the wall be built and before,then defined the comprehensive waterproof coefficient of the wall,discussed the method of the waterproof effect grade division,and on these basis,propose the concept of pit geotechnical surface permeability coefficient,and use the coefficient to calculate the pit leakage amount.To a certain extent,it fill a blank of how to quantitatively evaluate the cut-off wall affect on the foundation pit dewatering,provide some theoretical basis to the dewatering design which foundation pit with the sealed cut-off wall.